IOTA/IOTA-ES occultation update for (240) Vanadis / UCAC4 558-013596 event on 2024 Jul 26, 20:38 UT Visible from Summary ------- On 2024 Jul 26 UT, the 93.8067579358309 km diameter asteroid (240) Vanadis will occult a 11.7 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.39 mag to 13.96 mag (the magnitude of the asteroid) for at most 2.280 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2024 Jul 26, 20:35 - 2024 Jul 26, 20:40 * geocentric midpoint of event [JD]: 2460518.35983958 * magnitude of target star: 11.70 * magnitude drop [mag]: 2.39 * estimated maximum duration [s]: 2.280 * Moon: 64 % sunlit, 60° distance * Sun: 46° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 0.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.001", 83°) * approx speed of asteroid's shadow [km/s]: 41.2905 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 558-013596 by 240 Vanadis on 2024 Jul 26 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 104 0 0 -24 59 39 20 35 46.6 0 66 -42 .. .. .. -24 29 45 .. .. .. -24 28 52 .... 105 0 0 -24 35 22 20 35 46.6 1 66 -41 -25 5 23 -24 5 28 -25 6 16 -24 4 36 0.09 106 0 0 -24 11 0 20 35 46.7 2 65 -40 -24 41 1 -23 41 5 -24 41 54 -23 40 13 0.23 107 0 0 -23 46 32 20 35 46.8 3 65 -40 -24 16 33 -23 16 37 -24 17 26 -23 15 45 0.28 108 0 0 -23 21 59 20 35 47.0 4 64 -39 -23 52 0 -22 52 4 -23 52 53 -22 51 11 0.31 109 0 0 -22 57 21 20 35 47.3 5 64 -38 -23 27 22 -22 27 26 -23 28 15 -22 26 34 0.33 110 0 0 -22 32 39 20 35 47.6 6 64 -37 -23 2 41 -22 2 45 -23 3 34 -22 1 52 0.34 111 0 0 -22 7 54 20 35 47.9 7 63 -36 -22 37 56 -21 38 0 -22 38 48 -21 37 8 0.34 112 0 0 -21 43 7 20 35 48.3 8 63 -35 -22 13 8 -21 13 13 -22 14 1 -21 12 20 0.35 113 0 0 -21 18 17 20 35 48.7 9 63 -34 -21 48 18 -20 48 24 -21 49 11 -20 47 31 0.36 114 0 0 -20 53 26 20 35 49.2 10 62 -33 -21 23 26 -20 23 33 -21 24 19 -20 22 41 0.36 115 0 0 -20 28 35 20 35 49.8 11 62 -32 -20 58 34 -19 58 42 -20 59 27 -19 57 50 0.36 116 0 0 -20 3 43 20 35 50.4 12 61 -31 -20 33 41 -19 33 51 -20 34 34 -19 32 59 0.37 117 0 0 -19 38 52 20 35 51.0 13 61 -30 -20 8 49 -19 9 1 -20 9 42 -19 8 8 0.37 118 0 0 -19 14 1 20 35 51.8 14 61 -29 -19 43 58 -18 44 11 -19 44 51 -18 43 19 0.37 119 0 0 -18 49 13 20 35 52.5 15 60 -28 -19 19 9 -18 19 24 -19 20 1 -18 18 32 0.37 120 0 0 -18 24 27 20 35 53.3 16 60 -27 -18 54 22 -17 54 39 -18 55 14 -17 53 47 0.37 121 0 0 -17 59 44 20 35 54.2 17 60 -26 -18 29 38 -17 29 58 -18 30 30 -17 29 6 0.37 122 0 0 -17 35 5 20 35 55.1 18 59 -25 -18 4 57 -17 5 20 -18 5 50 -17 4 28 0.38 123 0 0 -17 10 31 20 35 56.1 19 59 -24 -17 40 21 -16 40 47 -17 41 14 -16 39 55 0.38 124 0 0 -16 46 1 20 35 57.2 21 59 -23 -17 15 50 -16 16 19 -17 16 43 -16 15 27 0.38 125 0 0 -16 21 37 20 35 58.2 22 58 -22 -16 51 25 -15 51 57 -16 52 17 -15 51 5 0.38 126 0 0 -15 57 20 20 35 59.4 23 58 -20 -16 27 5 -15 27 41 -16 27 58 -15 26 49 0.38 127 0 0 -15 33 9 20 36 0.6 24 58 -19 -16 2 53 -15 3 32 -16 3 45 -15 2 40 0.38 128 0 0 -15 9 6 20 36 1.8 25 57 -18 -15 38 48 -14 39 31 -15 39 40 -14 38 39 0.38 129 0 0 -14 45 11 20 36 3.1 26 57 -17 -15 14 51 -14 15 38 -15 15 43 -14 14 46 0.38 130 0 0 -14 21 25 20 36 4.5 27 57 -16 -14 51 3 -13 51 54 -14 51 55 -13 51 2 0.38 131 0 0 -13 57 49 20 36 5.9 28 56 -15 -14 27 25 -13 28 19 -14 28 17 -13 27 28 0.38 132 0 0 -13 34 22 20 36 7.3 29 56 -14 -14 3 56 -13 4 55 -14 4 48 -13 4 3 0.38 133 0 0 -13 11 6 20 36 8.8 30 55 -13 -13 40 38 -12 41 41 -13 41 29 -12 40 49 0.38 134 0 0 -12 48 1 20 36 10.3 31 55 -12 -13 17 30 -12 18 38 -13 18 22 -12 17 47 0.38 135 0 0 -12 25 8 20 36 11.9 32 55 -11 -12 54 35 -11 55 48 -12 55 27 -11 54 56 0.39 136 0 0 -12 2 27 20 36 13.5 33 54 -10 -12 31 52 -11 33 9 -12 32 44 -11 32 18 0.39 137 0 0 -11 40 0 20 36 15.2 34 54 -9 -12 9 22 -11 10 44 -12 10 13 -11 9 53 0.39 138 0 0 -11 17 45 20 36 17.0 35 54 -8 -11 47 5 -10 48 32 -11 47 56 -10 47 41 0.39 139 0 0 -10 55 45 20 36 18.7 36 53 -7 -11 25 2 -10 26 34 -11 25 53 -10 25 43 0.39 140 0 0 -10 33 59 20 36 20.5 37 53 -6 -11 3 13 -10 4 50 -11 4 5 -10 3 59 0.39 141 0 0 -10 12 28 20 36 22.4 38 52 -5 -10 41 40 - 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Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 558-013596 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 07 33.8860 DE: +21 29 13.152 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 07 33.8860 DE: +21 29 13.153 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (240) Vanadis asteroid class: approx. diameter [km]: 94 approx. diameter ["]: 0.048 distance from Earth [AU]: 2.67820 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#68 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.008", 0.001", 83.342° remarks: * orbital elements for (240)Vanadis : Mean anomaly = 0.9678102425 deg Arg. of pericenter = 300.8717539512 deg Long. of node = 115.0530886612 deg Inclination = 2.1057938412 deg Eccentricity = 0.2092080029 Semimajor axis = 2.6641334344 AU Perihelion dist = 2.1067753992 AU Mag: H = 9.20, G = 0.15 Epoch of elements : MJD 60517.85983966 TDT (2024 Jul 26.8598) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#682023Apr24,2.28,2024,7,26,20.636150,0.034339,-0.368316,23.209582,2.112283,-0.003689,-0.000415,-0.000001,0.000000 -177.3174,21.5197,-127.90,19.17,False UCAC4 558-013596,5.12607937,21.4869867,12.48,11.70,11.28,0.1,0,,5.15023811,21.5196969,2.39,2.36,0,0,0 240,Vanadis,13.96,94.001,2.6782,0,0,5.462,6.93,,5.2,0 0,0.7729,2024,7,26,300.8718,115.0531,2.1058,0.20921,2.66413,2.10678,9.19,5.0,0.15 1.015,0.0083,0.0007,83,0.0007,Known errors,1.18,0,-1,-1 20240726_013596,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org